side effects of topical ghk cu “Is GHK-Cu actually worth it?” is genuinely one the most common questions in my comments, so let me finally answer it properly., The short version: copper peptides have real research behind them, GHK-CU Making Skin Worse: Complete
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Gut health - For vitamin B12 to be absorbed effectively, it needs to bind with a protein called intrinsic factor, which is produced in the stomach
Should I be Taking a Multivitamin
That said, it comes with limitations

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thus, peptide hormones do not accumulate in tissues [1,2]